help with network configuration

["Cássio Tavares" <cassio.ufg@gmail.com>]

Hello there!

I'm having trouble setting up `connman`. This is my services declaration:

```
    (services
      (append
       (list
          (service wpa-supplicant-service-type)
         (service connman-service-type
            (connman-configuration
             (disable-vpn? #t)))
          (service openssh-service-type
           (openssh-configuration
              (port-number 2112)
             (permit-root-login 'prohibit-password)
              (password-authentication? #f)
             (x11-forwarding? #t)
              (accepted-environment '("COLORTERM"))))
          (service ntp-service-type)
         (service gpm-service-type)
          (service cups-service-type)
         (service elogind-service-type)
          (service sddm-service-type
           (sddm-configuration
              (display-server "wayland")
             (numlock "on")
              (theme "guix-simplyblack-sddm-theme")
             (xorg-configuration
                (xorg-configuration
                 (keyboard-layout %this-keyboard))))))
         %base-services))
```

This returns no error on `guix system reconfigure`. But when I try to run
`connmanctl state` (or any other `connmanctl` command) I get this error:

Error: the name net.connman is not provided by any .service files
>

So, what is going on, and how to fix it?

Thanks
Cássio